Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

تمرين 39

Piaget divided cognitive development into four stages. In the first, lasting from birth to about age 2, infants interact with and learn about their environments by relating their sensory experiences to their motor actions; this is called the (a) _____ stage. A significant development of this stage is the knowledge that objects or events continue to exist even if they cannot be heard, touched, or seen; this is called (b) _____.